Chapter 1 Precautions in Usage
11
Absolute high/low limit temperature (& humidity) alarms and
upper deviation limit temperature alarm
The absolute high/low limit alarms are completely independent of the
target temperature (& humidity). They do not change when target
temperature (or humidity) has been changed.
On the other hand, the upper deviation limit alarm is relative to the
target temperature.
If the target temperature is changed, the deviation alarm temperature
changes in proportion.
45
Temperature(°C)
Time
Constant mode
start
Constant mode
end
35
25
5
Absolute high limit temperature alarm
Upper deviation limit temperature alarm (Target tempe10°C)
Target temperature
Absolute low limit temperature alarm
Fig. 1.1 Temperature alarm settings
Safety Device Setting Example
High limit temperature
In this example, the target temperature is 60°C and the maximum
allowed temperature of the specimens is 80°C. Safety devices are set as
follows.
Table 1.2 Setting example for overheat protector
and high limit temperature alarms
Overheat protector
+80°C
・
Set 20°C higher than
target temperature.
・
Set to specimen's
maximum allowed
temperature.
Absolute
high limit
+75°C
・
Set 15°C higher than
target temperature.
・
Set 5°C lower than
specimen's maximum
allowed temperature.
Temperature
(and Humidity)
controller
Upper
deviation
limit
+10°C
Will trip at 70°C.
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